Optical: systems and elements – Lens – Eyepiece
Reexamination Certificate
1999-09-16
2001-01-30
Epps, Georgia (Department: 2873)
Optical: systems and elements
Lens
Eyepiece
C359S643000, C359S713000, C359S716000, C359S757000, C359S784000
Reexamination Certificate
active
06181479
ABSTRACT:
BACKGROUND OF THE INVENTION
Heretofore, various types of display image observation devices have been conventionally known which display a desired image from an image display element, such as a liquid crystal display panel, and which enlarge the image using an eyepiece. An example of such an eyepiece used in a display image observation device is the eyepiece disclosed in Japanese Laid-Open Patent Application H6-308396. This eyepiece makes it possible to obtain a flat and clear image throughout the periphery of the field while using only a few lens elements by employing an aspherical surface and by making the object surface (i.e., the source image) a curved surface. However, this eyepiece is limited to cases where the range for favorably correcting the aberration designates an entrance pupil diameter of less than 4 mm (since the brightest lens disclosed has an F
No.
of 3.7).
The pupil diameter of most people is in the range from 3 to 4 mm and, when observing in a motionless environment, using a lens with an F
No.
of 3.7 gives satisfactory results. However, when the observation is accompanied by vibrations or other motion, such as while the observer is riding in an automobile or while walking, the entrance pupil of the eyepiece and the pupil of the observer can be temporarily offset as much as 3 to 5 mm due to the vibrations or other motion. Therefore, if the various aberrations are not favorably corrected for an entrance pupil of several tens of millimeters, then the viewed image will deteriorate to an inferior image quality as a result of the vibrations or other motions. This breakdown in the image quality causes favorable observation under such conditions to become difficult.
BRIEF SUMMARY OF THE INVENTION
The present invention is an eyepiece for a display image observation device used when enlarging and observing images displayed in an image display device. More specifically, the present invention relates to an eyepiece for observing an image of an object that is formed at an image display surface of an image intensifier which intensifies low-level light collected by an object lens of a night vision device. A first object of the present invention is to provide an eyepiece for a display image observation device that is light in weight. A second object of the invention is to provide such an eyepiece that is also compact. A third object of the invention is to provide such an eyepiece that enables viewing with high image quality even during unfavorable viewing conditions, such as when the observer is riding in a vehicle or while walking.
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Arnold Bruce Y.
Epps Georgia
Fuji Photo Optical Co., Ltd.
International Arnold
Lester Evelyn A.
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